HEATER & AIR CONDITIONER SECTION
HA
GI MA EM
CONTENTS
LC EC
PRECAUTIONS AND PREPARATION............................3 Supplemental Restraint System (SRS) ″AIR BAG″ and ″SEAT BELT PRE-TENSIONER″...............3 Precautions for Working with HFC-134a (R-134a) .....3 General Refrigerant Precautions .................................4 Precautions for Leak Detection Dye............................4 A/C Identification Label................................................5 Precautions for Refrigerant Connection ......................5 Precautions for Servicing Compressor........................8 Special Service Tools ..................................................9 HFC-134a (R-134a) Service Tools and Equipment..................................................................10 Precautions for Service Equipment ...........................14 DESCRIPTION ...............................................................16 Refrigeration Cycle ....................................................16 V-6 Variable Displacement Compressor....................17 Component Layout ....................................................20 Air Conditioner LAN System......................................21 Automatic Temperature Control (ATC) System .........23 Overview of Control System......................................24 Control Operation ......................................................24 Discharge Air Flow.....................................................27 TROUBLE DIAGNOSES ...............................................29 How to Perform Trouble Diagnoses for Quick and Accurate Repair ..................................................29 Operational Check .....................................................30 Symptom Chart..........................................................36 Self-diagnosis ............................................................37 Preliminary Check......................................................55 Performance Test Diagnoses ....................................63 Performance Chart ....................................................65 Trouble Diagnoses for Abnormal Pressure ...............66 Component Location..................................................69 Circuit Diagram/Without Navigation System .............71 Wiring Diagram - A/C -/Without Navigation System .......................................................................72 Circuit Diagram/With Navigation System ..................77
Wiring Diagram - A/C, A -/With Navigation System .......................................................................78 Auto Amp. Terminals and Reference Value...............83 Main Power Supply and Ground Circuit Check ........86 Self-diagnosis Circuit .................................................88 Multiplex Communication Circuit ...............................89 Ambient Sensor Circuit..............................................90 In-vehicle Sensor Circuit............................................93 Intake Sensor Circuit .................................................96 Sunload Sensor Circuit..............................................97 Mode Door Motor Circuit (LAN)...............................100 Air Mix Door Motor Circuit (LAN) ............................102 Bi-level Door Motor Circuit (LAN)............................104 LAN System Circuit .................................................106 Intake Door Motor Circuit ........................................109 Blower Motor Circuit ................................................113 Magnet Clutch Circuit ..............................................118 Rear Vent Door Motor Circuit ..................................122 Control Linkage Adjustment.....................................123 SERVICE PROCEDURES ...........................................125 HFC-134a (R-134a) Service Procedure ..................125 Maintenance of Lubricant Quantity in Compressor .............................................................128 Refrigerant Lines .....................................................130 Checking Refrigerant Leaks ....................................131 Electronic Refrigerant Leak Detector ......................131 Fluorescent Dye Leak Detector...............................134 Compressor Mounting .............................................135 Belt Tension .............................................................135 Fast Idle Control Device (FICD) ..............................135 Compressor .............................................................136 Compressor Clutch ..................................................136 Ventilation Air Filter..................................................139 SERVICE DATA AND SPECIFICATIONS (SDS) ........140 General Specifications.............................................140 Inspection and Adjustment ......................................140
FE AT PD FA RA BR ST RS BT
EL IDX
CONTENTS
(Cont’d)
When you read wiring diagrams: I Read GI section, “HOW TO READ WIRING DIAGRAMS”. I See EL section, “POWER SUPPLY ROUTING” for power distribution circuit. When you perform trouble diagnoses, read GI section, “HOW TO FOLLOW FLOW CHART IN TROUBLE DIAGNOSES” and “HOW TO PERFORM EFFICIENT DIAGNOSIS FOR AN ELECTRICAL INCIDENT”.
HA-2
PRECAUTIONS AND PREPARATION Supplemental Restraint System (SRS) “AIR BAG” and “SEAT BELT PRE-TENSIONER” The Supplemental Restraint System such as “AIR BAG” and “SEAT BELT PRE-TENSIONER” used along with a seat belt, helps to reduce the risk or severity of injury to the driver and front passenger for certain types of collision. The SRS system composition which is available to INFINITI Q45 is as follows: I For a frontal collision The Supplemental Restraint System consists of driver air bag module (located in the center of the steering wheel), front passenger air bag module (located on the instrument panel on passenger side), seat belt pre-tensioners, a diagnosis sensor unit, warning lamp, wiring harness and spiral cable. I For a side collision The Supplemental Restraint System consists of front side air bag module (located in the outer side of front seat), satellite sensor, diagnosis sensor unit (one of components of air bags for a frontal collision), wiring harness, warning lamp (one of components of air bags for a frontal collision). Information necessary to service the system safely is included in the RS section of this Service Manual. WARNING: I To avoid rendering the SRS inoperative, which could increase the risk of personal injury or death in the event of a collision which would result in air bag inflation, all maintenance should be performed by an authorized INFINITI dealer. I Improper maintenance, including incorrect removal and installation of the SRS, can lead to personal injury caused by unintentional activation of the system. For removal of Spiral Cable and Air Bag Module, see the RS section. I Do not use electrical test equipment on any circuit related to the SRS unless instructed to in this Service Manual. Spiral cable and wiring harnesses (except satellite sensor and side air bag module) covered with yellow insulation tape either just before the harness connectors or for the complete harness are related to the SRS.
Precautions for Working with HFC-134a (R-134a) WARNING: I CFC-12 (R-12) refrigerant and HFC-134a (R-134a) refrigerant are not compatible. If the refrigerants are mixed, compressor malfunction is likely to occur, refer to “Contaminated refrigerant” below. To determine the purity of HFC-134a (R-134a) in the vehicle and recovery tank, use Refrigerant Recovery/Recycling Recharging equipment (ACR4) (J-39500-INF) and Refrigerant Identifier. I Use only specified lubricant for the HFC-134a (R-134a) A/C system and HFC-134a (R-134a) components. If lubricant other than that specified is used, compressor failure is likely to occur. I The specified HFC-134a (R-134a) lubricant rapidly absorbs moisture from the atmosphere. The following handling precautions must be observed: a: When removing refrigerant components from a vehicle, immediately cap (seal) the component to minimize the entry of moisture from the atmosphere. b: When installing refrigerant components to a vehicle, do not remove the caps (unseal) until just before connecting the components. Connect all refrigerant loop components as quickly as possible to minimize the entry of moisture into system. c: Only use the specified lubricant from a sealed container. Immediately reseal containers of lubricant. Without proper sealing, lubricant will become moisture saturated and should not be used. d: Avoid breathing A/C refrigerant and lubricant vapor or mist. Exposure may irritate eyes, nose and throat. Remove R-134a from the A/C system, using certified service equipment meeting requirements of SAE J2210 (R-134a recycling equipment), or J2209 (R-134a recovery equipment). If accidental system discharge occurs, ventilate work area before resuming service. Additional health and safety information may be obtained from refrigerant and lubricant manufacturers. e: Do not allow lubricant (Nissan A/C System Oil Type S) to come in contact with styrofoam parts. Damage may result.
HA-3
GI MA EM LC EC FE AT PD FA RA BR ST RS BT
EL IDX
PRECAUTIONS AND PREPARATION Precautions for Working with HFC-134a (R-134a) (Cont’d) Contaminated refrigerant If a refrigerant other than pure R-134a is identified in a vehicle, your options are: I Explain to the customer that environmental regulations prohibit the release of contaminated refrigerant into the atmosphere. I Explain that recovery of the contaminated refrigerant could damage your service equipment and refrigerant supply. I Suggest the customer return the vehicle to the location of previous service where the contamination may have occurred. I If you choose to perform the repair, recover the refrigerant using only dedicated equipment and containers. Do not recover contaminated refrigerant into your existing service equipment. If your facility does not have dedicated recovery equipment, you may contact a local refrigerant product retailer for available service. This refrigerant must be disposed of in accordance with all federal and local regulations. In addition, replacement of all refrigerant system components on the vehicle is recommended. I If the vehicle is within the warranty period, the air conditioner warranty is void. Please contact INFINITI Customer Affairs for further assistance.
General Refrigerant Precautions WARNING: I Do not release refrigerant into the air. Use approved recovery/recycling equipment to capture the refrigerant every time an air conditioning system is discharged. I Always wear eye and hand protection (goggles and gloves) when working with any refrigerant or air conditioning system. I Do not store or heat refrigerant containers above 52°C (125°F). I Do not heat a refrigerant container with an open flame; if container warming is required, place the bottom of the container in a warm pail of water. I Do not intentionally drop, puncture, or incinerate refrigerant containers. I Keep refrigerant away from open flames: poisonous gas will be produced if refrigerant burns. I Refrigerant will displace oxygen, therefore be certain to work in well ventilated areas to prevent suffocation. I Do not pressure test or leak test HFC-134a (R-134a) service equipment and/or vehicle air conditioning systems with compressed air during repair. Some mixtures of air and R-134a have been shown to be combustible at elevated pressures. These mixtures, if ignited, may cause injury or property damage. Additional health and safety information may be obtained from refrigerant manufacturers.
Precautions for Leak Detection Dye I I I I I I I I I
The A/C system contains a fluorescent leak detection dye used for locating refrigerant leaks. An ultraviolet (UV) lamp is required to illuminate the dye when inspecting for leaks. Always wear fluorescence enhancing UV safety glasses to protect your eyes and enhance the visibility of the fluorescent dye. A compressor shaft seal should not be repaired because of dye seepage. The compressor shaft seal should only be repaired after confirming the leak with an electronic refrigerant leak detector (J-41995). Always remove any dye from the leak area after repairs are complete to avoid a misdiagnosis during a future service. Do not allow dye to come into contact with painted body panels or interior components. If dye is spilled, clean immediately with the approved dye cleaner. Fluorescent dye left on a surface for an extended period of time cannot be removed. Do not spray the fluorescent dye cleaning agent on hot surfaces (engine exhaust manifold, etc.). Do not use more than one refrigerant dye bottle (1/4 ounce / 7.4 cc) per A/C system. Leak detection dyes for R-134a and R12 A/C systems are different. Do not use R-134a leak detection dye in R-12 A/C system or R-12 leak detection dye in R-134a A/C systems or A/C system damage may result. The fluorescent properties of the dye will remain for over three (3) years unless a compressor failure occurs.
HA-4
PRECAUTIONS AND PREPARATION A/C Identification Label Vehicles with factory installed fluorescent dye have this identification label on the under side of hood. NOTE: Vehicles with factory installed fluorescent dye have a green label. Vehicles without factory installed fluorescent dye have a blue label.
GI MA EM
SHA436FA
Precautions for Refrigerant Connection A new type refrigerant connection has been introduced to all refrigerant lines except the following location. I Expansion valve to cooling unit I Condenser to liquid tank
LC EC
FEATURES OF NEW TYPE REFRIGERANT CONNECTION I I
The O-ring is relocated in a groove for proper installation. This eliminates the chance of the O-ring being caught in, or damaged by, the mating part. The sealing direction of the O-ring is now set vertically in relation to the contacting surface of the mating part to improve sealing characteristics. The reaction force of the O-ring will not occur in the direction that causes the joint to pull out, thereby facilitating piping connections.
FE AT PD FA RA BR ST RS BT
EL IDX
HA-5
PRECAUTIONS AND PREPARATION Precautions for Refrigerant Connection (Cont’d)
SHA815E
O-RING AND REFRIGERANT CONNECTION
RHA895FB
CAUTION: The new and former refrigerant connections use different O-ring configurations. Do not confuse O-rings since they are not interchangeable. If a wrong O-ring is installed, refrigerant will leak at, or around, the connection.
HA-6
PRECAUTIONS AND PREPARATION Precautions for Refrigerant Connection (Cont’d) O-ring part numbers and specifications Connection type
O-ring size
New Former New Former SHA814E
New Former New
8 12 16 19
Part number
D
mm (in) W
mm (in)
GI 92471 N8210
6.8 (0.268)
1.85 (0.0728)
92470 N8200
6.07 (0.2390)
1.78 (0.0701)
92472 N8210
10.9 (0.429)
2.43 (0.0957)
92475 71L00
11.0 (0.433)
2.4 (0.094)
92473 N8210
13.6 (0.535)
2.43 (0.0957)
92475 72L00
14.3 (0.563)
2.3 (0.091)
92474 N8210
16.5 (0.650)
2.43 (0.0957)
WARNING: Make sure all refrigerant is discharged into the recycling equipment and the pressure in the system is less than atmospheric pressure. Then gradually loosen the discharge side hose fitting and remove it. CAUTION: When replacing or cleaning refrigerant cycle components, observe the following. I When the compressor is removed, store it in the same position as it is when mounted on the car. Failure to do so will cause lubricant to enter the low pressure chamber. I When connecting tubes, always use a torque wrench and a back-up wrench. I After disconnecting tubes, immediately plug all openings to prevent entry of dirt and moisture. I When installing an air conditioner in the vehicle, connect the pipes as the final stage of the operation. Do not remove the seal caps of pipes and other components until just before required for connection. I Allow components stored in cool areas to warm to working area temperature before removing seal caps. This prevents condensation from forming inside A/C components. I Thoroughly remove moisture from the refrigeration system before charging the refrigerant. I Always replace used O-rings. I When connecting tube, apply lubricant to circle of the O-rings shown in illustration. Be careful not to apply lubricant to threaded portion. Lubricant name: Nissan A/C System Oil Type S Part number: KLH00-PAGS0 I O-ring must be closely attached to dented portion of tube. I When replacing the O-ring, be careful not to damage O-ring and tube. I Connect tube until you hear it click, then tighten the nut or bolt by hand until snug. Make sure that the O-ring is installed to tube correctly. I After connecting line, conduct leak test and make sure that there is no leakage from connections. When the gas leaking point is found, disconnect that line and replace the O-ring. Then tighten connections of seal seat to the specified torque.
MA EM LC EC FE AT PD FA RA BR ST RS BT
EL IDX
HA-7
PRECAUTIONS AND PREPARATION Precautions for Refrigerant Connection (Cont’d)
RHA861F
Precautions for Servicing Compressor I I I I I I
Plug all openings to prevent moisture and foreign matter from entering. When the compressor is removed, store it in the same position as it is when mounted on the car. When replacing or repairing compressor, follow “Maintenance of Lubricant Quantity in Compressor” exactly. Refer to HA-128. Keep friction surfaces between clutch and pulley clean. If the surface is contaminated, with lubricant, wipe it off by using a clean waste cloth moistened with thinner. After compressor service operation, turn the compressor shaft by hand more than five turns in both directions. This will equally distribute lubricant inside the compressor. After the compressor is installed, let the engine idle and operate the compressor for one hour. After replacing the compressor magnet clutch, apply voltage to the new one and check for normal operation.
HA-8
PRECAUTIONS AND PREPARATION Special Service Tools The actual shapes of Kent-Moore tools may differ from those of special service tools illustrated here. Tool number (Kent-Moore No.) Tool name
Description
GI
KV99106100 (J-41260) Clutch disc wrench
Removing center bolt
MA EM NT232
LC EC FE AT PD FA NT378
KV99232340 (J-38874) or KV992T0001 ( — ) Clutch disc puller
Removing clutch disc
RA BR ST
NT376
KV99106200 (J-41261) Pulley installer
Installing pulley
RS BT
NT235
EL IDX
HA-9
PRECAUTIONS AND PREPARATION HFC-134a (R-134a) Service Tools and Equipment Never mix HFC-134a refrigerant and/or its specified lubricant with CFC-12 (R-12) refrigerant and/or its lubricant. Separate and non-interchangeable service equipment must be used for handling each type of refrigerant/ lubricant. Refrigerant container fittings, service hose fittings and service equipment fittings (equipment which handles refrigerant and/or lubricant) are different between CFC-12 (R-12) and HFC-134a (R-134a). This is to avoid mixed use of the refrigerants/lubricant. Adapters that convert one size fitting to another must never be used: refrigerant/lubricant contamination will occur and compressor failure will result. Tool number (Kent-Moore No.) Tool name
Description
Note
HFC-134a (R-134a) refrigerant
Container color: Light blue Container marking: HFC-134a (R-134a) Fitting size: Thread size I large container 1/2″-16 ACME
NT196
KLH00-PAGS0 ( — ) Nissan A/C System Oil Type S
Type: Poly alkylene glycol oil (PAG), type S Application: HFC-134a (R-134a) swash plate (piston) compressors (Nissan only) Lubricity: 40 m (1.4 US fl oz, 1.4 Imp fl oz)
NT197
(J-39500-INF) Recovery/Recycling Recharging equipment (ACR4)
Function: Refrigerant Recovery and Recycling and Recharging
NT195
(J-41995) A/C leak detector
Function: Checks for refrigerant leaks.
AHA281A
HA-10
PRECAUTIONS AND PREPARATION HFC-134a (R-134a) Service Tools and Equipment (Cont’d) Tool number (Kent-Moore No.) Tool name
Description
Note
(J-43926) Refrigerant dye leak detection kit Kit includes: (J-42220) UV lamp and UV safety glasses (J-41459) Refrigerant dye injector (J-41447) qty. 24 R-134a refrigerant dye (J-43872) Refrigerant dye cleaner
Power supply: DC 12V (Battery terminal)
GI MA EM LC EC
SHA437F
UV lamp
(J-42220) Fluorescent dye leak detector
UV safety glasses
Power supply: DC 12V (Battery terminal) For checking refrigerant leak when fluorescent dye is installed in A/C system. Includes: UV lamp and UV safety glasses
FE AT PD
SHA438F
Dye
(J-41447) R134a Fluorescent Leak Detection Dye (Box of 24, 1/4 ounce bottles)
Application: For R-134a PAG oil Container: 1/4 ounce (7.4 cc) bottle (Includes self-adhesive dye identification labels for affixing to vehicle after charging system with dye.)
FA RA BR
SHA439F
ST Dye injector
(J-41459) R134a Dye Injector Use with J-41447, 1/4 ounce bottle
For injecting 1/4 ounce of Fluorescent Leak Detection Dye into A/C system.
RS BT SHA440F
(J-43872) Dye cleaner
For cleaning dye spills.
EL IDX SHA441F
HA-11
PRECAUTIONS AND PREPARATION HFC-134a (R-134a) Service Tools and Equipment (Cont’d) Tool number (Kent-Moore No.) Tool name
Description
Note
(J-39183) Manifold gauge set (with hoses and couplers)
Identification: I The gauge face indicates R-134a. Fitting size: Thread size I 1/2″-16 ACME
NT199
Service hoses I High side hose (J-39501-72) I Low side hose (J-39502-72) I Utility hose (J-39476-72)
Hose color: I Low hose: Blue with black stripe I High hose: Red with black stripe I Utility hose: Yellow with black stripe or green with black stripe Hose fitting to gauge: I 1/2″-16 ACME
NT201
Service couplers I High side coupler (J-39500-20) I Low side coupler (J-39500-24)
Hose fitting to service hose: I M14 x 1.5 fitting is optional or permanently attached.
NT202
(J-39650) Refrigerant weight scale
For measuring of refrigerant Fitting size: Thread size I 1/2″-16 ACME
NT200
(J-39649) Vacuum pump (Including the isolator valve)
Capacity: I Air displacement: 4 CFM I Micron rating: 20 microns I Oil capacity: 482 g (17 oz) Fitting size: Thread size I 1/2″-16 ACME NT203
HA-12
Thank you very much for your reading. Please Click Here. Then Get COMPLETE MANUAL. NO WAITING
NOTE: If there is no response to click on the link above, please download the PDF document first and then click on it.
PRECAUTIONS AND PREPARATION HFC-134a (R-134a) Service Tools and Equipment (Cont’d) COMMERCIAL SERVICE TOOL Tool name
Description
Note Function: Checks refrigerant purity and for system contamination.
Refrigerant identifier equipment
GI MA EM LC EC
NT765
FE AT PD FA RA BR ST RS BT
EL IDX
HA-13
PRECAUTIONS AND PREPARATION Precautions for Service Equipment RECOVERY/RECYCLING EQUIPMENT Be certain to follow the manufacturers instructions for machine operation and machine maintenance. Never introduce any refrigerant other than that specified into the machine.
ELECTRONIC LEAK DETECTOR Be certain to follow the manufacturer’s instructions for tester operation and tester maintenance.
VACUUM PUMP The lubricant contained inside the vacuum pump is not compatible with the specified lubricant for HFC-134a (R-134a) A/C systems. The vent side of the vacuum pump is exposed to atmospheric pressure. So the vacuum pump lubricant may migrate out of the pump into the service hose. This is possible when the pump is switched off after evacuation (vacuuming) and hose is connected to it. To prevent this migration, use a manual valve placed near the hose-to-pump connection, as follows. I Usually vacuum pumps have a manual isolator valve as part of the pump. Close this valve to isolate the service hose from the pump. I For pumps without an isolator, use a hose equipped with a manual shut-off valve near the pump end. Close the valve to isolate the hose from the pump. I If the hose has an automatic shut off valve, disconnect the hose from the pump. As long as the hose is connected, the valve is open and lubricating oil may migrate. Some one-way valves open when vacuum is applied and close under a no vacuum condition. Such valves may restrict the pump’s ability to pull a deep vacuum and are not recommended. RHA270D
MANIFOLD GAUGE SET Be certain that the gauge face indicates R-134a or 134a. Be sure the gauge set has 1/2″-16 ACME threaded connections for service hoses. Confirm the set has been used only with refrigerant HFC134a (R-134a) and specified lubricants.
SHA533D
SERVICE HOSES Be certain that the service hoses display the markings described (colored hose with black stripe). All hoses must include positive shut off devices (either manual or automatic) near the end of the hoses opposite the manifold gauge.
RHA272D
HA-14
PRECAUTIONS AND PREPARATION Precautions for Service Equipment (Cont’d) SERVICE COUPLERS Never attempt to connect HFC-134a (R-134a) service couplers to an CFC-12 (R-12) A/C system. The HFC-134a (R-134a) couplers will not properly connect to the CFC-12 (R-12) system. However, if an improper connection is attempted, discharging and contamination may occur. Shut-off valve rotation
A/C service valve
Clockwise
Open
Counterclockwise
Close
GI MA EM
RHA273D
REFRIGERANT WEIGHT SCALE Verify that no refrigerant other than HFC-134a (R-134a) and specified lubricants have been used with the scale. If the scale controls refrigerant flow electronically, the hose fitting must be 1/2″-16 ACME.
CALIBRATING ACR4 WEIGHT SCALE
RHA274D
Calibrate the scale every 3 months. To calibrate the weight scale on the ACR4 (J-39500-INF): 1. Press Shift/Reset and Enter at the same time. 2. Press 8787. “A1” will be displayed. 3. Remove all weight from the scale. 4. Press 0, then press Enter, “0.00” will be displayed and change to “A2”. 5. Place a known weight (dumbbell of similar weight), between 10 and 19 lbs., on the center of the weight scale. 6. Enter the known weight using 4 digits. (Example 10 lb = 10.00, 10.5 lb = 10.50) 7. Press Enter — the display returns to the vacuum mode. 8. Press Shift/Reset and Enter at the same time. 9. Press 6 — the known weight on the scale is displayed. 10. Remove the known weight from the scale. “0.00” will be displayed. 11. Press Shift/Reset to return the ACR4 to the program mode.
LC EC FE AT PD FA RA BR ST
CHARGING CYLINDER Using a charging cylinder is not recommended. Refrigerant may be vented into air from cylinder’s top valve when filling the cylinder with refrigerant. Also, the accuracy of the cylinder is generally less than that of an electronic scale or of quality recycle/recharge equipment.
RS BT
EL IDX
HA-15
DESCRIPTION Refrigeration Cycle REFRIGERANT FLOW The refrigerant flow is in the standard pattern. Refrigerant flows through the compressor, condenser, liquid tank, evaporator, and back to the compressor. The refrigerant evaporation through the evaporator coil is controlled by an externally pressure equalized expansion valve, located inside the evaporator case.
FREEZE PROTECTION Under normal operating conditions, when the AUTO is switched ON, the compressor runs continuously, and the evaporator pressure, and therefore temperature, is controlled by the V-6 variable displacement compressor to prevent freeze up.
REFRIGERANT SYSTEM PROTECTION Triple-pressure switch The triple-pressure switch is located on the liquid tank. If the system pressure rises or falls out of specifications, the switch opens to interrupt compressor clutch operation. Triple-pressure switch closes to turn on the cooling fan to reduce system pressure.
Fusible plug Opens at temperatures above 105°C (221°F), thereby discharging refrigerant to the atmosphere. If this plug is melted, check the refrigerant line and replace liquid tank.
RHA896F
HA-16